"There is a tendency for people to underestimate the effect of children's lives getting boring, but I have since realized that when that happens..."

[hardyweineberg]

"There is a tendency for people to underestimate the harmful effects of children's lives getting boring, but I have since realized that when that happens, their mental wellbeing suffers, putting them at risk of depression, anxiety disorders, and even suicide."
Source: me

1) Is it grammatical to say "effects of children's lives getting boring"?

2) About the "... when that happens..." part, did I reference with that grammatically?

 

[Tarheel]

Delete "but I have since realized" from that sentence.